Caffenol

Caffenol is a photographic alternative process whereby phenols, sodium carbonate and optionally vitamin C are used in aqueous solution as a film and print photographic developer.[1][2]

35 mm film developed in caffenol.

Other basic (as opposed to acidic) chemicals can be used in place of sodium carbonate; however, sodium carbonate is the most common.[1]

There are many formulas for caffenol, all based on preparations that contain caffeic acid (i.e., coffee or tea) and a pH modifier, most often sodium carbonate.[2][3] The chemistry of caffenol developers is based on the action of the reducing agent caffeic acid, which is chemically unrelated to caffeine.[1]

History

The 1995 technical photographic chemistry class at Rochester Institute of Technology, led by Scott Williams, developed a method of developing photographic film using standard household items. They tested mixtures of tea and coffee combined with agents to balance the pH and successfully made printable images for exposed film.[1]

References
  1. Williams, Scott. "A Use for that Last Cup of Coffee: Film and Paper Development". Rochester Institute of Technology.
  2. Film Photography Project: Coffee Break – Develop Film at Home with Caffenol, Film Photography Project.
  3. Digitaltruth Photo: Caffenol Formulas at the Wayback Machine (archived March 22, 2016)
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